Photoconductive organic materials for the near-IR radiation range

N. A. Davidenko, N. A. Derevyanko, A. A. Ishchenko, N. G. Kuvshinsky, A. V. Kulinich, O. Ya Neiland, M. V. Plotniece

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Polymer composition films based on polystyrene and containing electron donors, viz., substituted tetrathiafulvalenes, an electron acceptor, viz., 2,4,5,7-tetranitrofluoren-9-one, and sensitizers, viz., a cationic polymethine dye, 1,3,3-trimethyl-2-[3-(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)prop- 1-en-1-yl]-3H-indolium tetrafluoroborate, and a neutral mero- cyanine dye, 5-{3-[(1,3-dihydro-1,3,3-trimethyl-2H-indol-2-ylidene)ethylidene]-2-phenyl- cyclopent-1-en-1-ylmethylene}-2-thioxodihydropyrimidine-4,6(1H,5H)-dione, were prepared. The internal photo effect upon film irradiation in the near-IR range is provided by low ionization potentials of the donors and the high electron affinity of the acceptor. The photoconductivity increases upon replacement of a cationic dye by a neutral one, mainly because of photo generation of mobile charge carriers of both signs and a decrease in the activation energy for the photoconduction current. The decrease in the activation energy for the photocurrent is due to the fact that in the case of a neutral dye, the mobile charge carriers move away from each other during their separation, while in the case of a cationic dye, the colorless counter ion strongly holds the photo generated charge carrier.

Original languageEnglish
Pages (from-to)1674-1680
Number of pages7
JournalRussian Chemical Bulletin
Volume53
Issue number8
DOIs
Publication statusPublished - Aug 2004
Externally publishedYes

Keywords*

  • Electron-hole pairs
  • Organic dyes
  • Photo generation of charge carriers
  • Polymer compositions
  • Tetrathiafulvalenes

Field of Science*

  • 1.4 Chemical sciences

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database

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